Ore-screen.



J. NICHOLLS.

ORE SCREEN'. APPLlcATmN FILED 1AN.10.19|8.

Patented Oct. v22, 1918,

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W M M m m m T A l. NCHOLLS.

ORE SCREEN.

APPLICATION FILED JAN.10|19\8 A ,282, 108., Patented Oct. 22, 1918.

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WITNESS 1 INVENTOR.

{l/ua Nhalls A TTORNE YS Y This ,invention relates to oro mantled when desired.

UNITED sirenas rarnnr ernten.

To 'aZZ/wwi/t yz'z may concern: ,y Be it 'known that I, Jeux N10/norms, a citizen of'y the United States, residing at Globe. in the county of Gila and yState of rrifioiia',y have inifented new and useful lmj'nfotements'n Gre-Screens, ofwhichthe following is aspeciication. y n

i separating machinery, and particularly peitainsxto a mechanically operated ore screen. y

`rItis the principal object of this invention to provide a mechanism by which quartz and placer ore may be conveniently handled andl whicli will mechanically act to agitate the ore inl afmanner to separate it from the gangue.Y rlilith this idea in `View a vibrating screen has been provided which'is simple in construction and is suitably supported by flexibleinembers,'allowing it to be mechanically iib'i-ateill, said structure being decidedly inexpensive as to manufacturino` costs and operation and being easily assebot-her objectof this invent-ion is to pro vue a machine ofthe above cla s which fitted illvith Iadjustable rmeans for Varying the vibrating strokeof themechanism and thus controlling the action of the screen, this being necessary when different grades of ore are to be treated. Y Otherobjectswill appear hereinafter.

{"llhefinvention is illustrated by way of 'example in the' accompanying drawings, in which-r lfiguie 1 is a yiew inside elevation, illustrating the assembled machine with parts broken away 'to' more clearly disclose its construction.V

Fig. 2 is aiview in vertical scctirm, as seen on the line`2-2v ofiFigzl, and discloses in detaily thevibrating mechanism as well as the ,means for adjusting the stroke thereof.

"Referring moreparticularly to the drawings, 10 indicates a sub-frame, preferably formed of.paialleltimbers 11 and 12 which are securely held together by cross bolts v13 and cross timbers 14A. Secured in spaced relation to each other and alongthe outer sides of the timbers l1 are resilient supporting bars 15.. which.y are heldbetween clamping blocks 16V andl aredisposed at an inclination to the vertical. In practice it has been found that an angle of 72C is suitable for the placing of these bars.

Fixed to the upper ends of the bars, by blocks 17, is an ore screen 18 which is formed Specification of Letters Patent.

lbled or dis- JOHN NIcHoLLs, oreLoBE, ARIZONA.

' y y,onn-soRrEN.

raee'ata'foee. 22, 191s.

Application filed J'nuaryl, 1918. Serial No. 211,122.

The mechanical vibration of the screen is, Y

shaft 20 mounted' produced by a rotating within the bearing brackets 21 secured to the timbersl 11 and"12 This "shaft is preferably driven by a pulley 22 receiving power from a suitable power source. Fixed upon the shaft at a point intermediate its bearings is a cam 23, the for-A mation :of which is Vparticularl f shownl in F ig. 1.v Here it will be seen that the cam is formed with a gradual swirl followed 'by a flat farce. The arcuate portion of *they cani normally rests against a roller 24 which isV mounted upon a roller shaft held vwithin bearings which are secured to the underside of a motion frame 26. This frame is formedof parallel timbers which positively engage each of thesupporting barsl and, when moved horizontally, will cause'these bars to be deflected from their liXed support upon the subsframe, thus imparting a vibrating motion to the screen. k.This motion will be repeated as the cam 23 rotates, as will Vbe evident.

ln order that the extent lof vibration 4of the screen may be controlled and-may be varied to suit the requirements of different grades of oreswhich are treated, the ends of the cam shaft 20 which extend through the bearings 21 are directly held within Yeccentric bearing bushings 27. vThese bearings are cylindrical 'and may rotate within the bearings 21. The bores through the bushings, however, are eccentric to accommodate the shaft 20', tated in relation tothe' bearings, the shaft and cam will be nioyed towardor away from thenormal position of thc roller 2a. Simultaneous adjustment of these bushings is necessary and for that purpose a sprocket 28 is fixed to the. inner end of each bushingand thereafter connected with a complementary sprocket 29 upon an adjusting shaft 30 by means of a sprocket chain 31. The adjusting shaft 30 is rotatably secured upon bearings Xed to the sub-frame and here shown as in vertical alinenient with the bearings 2l. A

of Y the sub-frame.k

and thus when the bushings are rohand wheel 82 is secured to one end of the shaft and by its manipulation both of the bearing bushings may be simultaneously rotated and the eccentricity of the cam shaft 20 determined.

ln order that the screen may operate with ajsharp jerk and may be successively operated with a: steady movement a recoil spring 33 is secured to the sub-frame and connected with a spring rod Set fastenedat the forward end of the motion frame. The action of this spring is contrary to the action of the cam and will draw the motion frame rearwardly at the instant the cam releases it.

ln operation, the machine is set up, as shown in the drawings, and thereafter a quantity of ore may be placed upon the screen. The bolts of the bearings 2l may be slightly loosened to allow free rotation of the bearing bushings, after which the bearing bushings may be ad-v justed by the hand wheel 32 and the shaft 30. This adjustment will, as previously described, effect the position of the cam shaft 20', and control the movement of the screen as influenced by the cam. After a proper adjustment has been made the bolts may then be tightened to lock the bushings in place. As the cam shaft rotates in the direction indicated by the arrow a (see Fig. l) the motion frame and the screen will be forced in the direction of the arrow Z) (see Fig. l). Thus as the supporting members 15 yield the frame will be horizontally moved.

As soon as the cam passes the roller upon the motion frame the inherent resiliency of the supporting members l5 will act to restore the frame to its normal position. Extreme movement of the frame under this action will affect the spring 33 and again move the frame in the direction of arrow b. It will thus be seen that by a continued rot-ation of the cam the screen will be subjected to an alternate jerking movement or vibration which will act to separate the metal from the gangue.l This action will be particularly effective in the present mechanism due to the inclination of the screened floor which will cause the material to be forcibly encountered by the screen to facilitate in separating `the material. It will thus be seen that the meehanism here disclosed while inexpensive as to manufacturing cost and simple in operation yet provides an eifective means for readily screening material.

While l have shown the preferred form of my invention as now known to me, it will be understood that various changes in the combination, construction and arrange- C'opes of this patent may be obtained for rues five cents aros ment of parts may in the art without departing from the spirit of the invention as claimed.

Having thus described my invention, what claim and desire to secure by Letters Patent is l. An ore screening machine comprising a base, a series of resilient bars secured to said base and disposed parallelly to each other and at an angle to the vertical, an ore screen secured to the upper ends of said bars and at an angle to the horizontal, a motion frame fixed to the bars and interposed between the base and the screen, mechanical means for engaging the motion frame to vibrate the screen, and means whereby the vibrating stroke of the screen may be varied, said means including a cam and bearing bushings which are adjustable with relation to the motion frame.

2. ln an ore screening machine, vibrat-V ing means comprising av rotating shaft, an eccentric cam secured thereon, a floating motion frame adapted to be affected by the cam, and means whereby the effective stroke of the cam may be adjusted, said means in cluding eccentric bushings within which the shaft is journaled, said bushings being turnable with respect to the normal position of the floating frame.

3. ln an ore screening machine, a vibrating mechanism comprising. a motion frame, an eccentric @am adapted to intermittently engage said motion frame, a rotatable shaft upon which said cam isV fixed, an adjusting mechanism whereby the shaft may be 4variably disposed in relation to the motion frame and the effective stroke of the cam thus regulated, and means to simultaneously adjust the adjusting mechanism. g

a. An ore screening machine including a vibrating mechanism comprisingk a rotating shaft, acam carried thereby, a contact means against which the cam acts, bushings in which the cam shaft is borne, sprockets upon each of the bushings,` complementary sprockets and chains connectin said sprocketswith the first named sproc ets, a shaft to which said second sprockets are fixed, and means to turn and adjust them and the bushings.A

ln testimony whereof have hereunto set my hand in the presence of two subscribing witnesses.

JOHN NECHGLLS.

Witnesses:

GEORGE '3. Hna., TOM Brmwnn each, by addressing the Commissioner et Eatents,

Washington, D. G.

be made by those skilledy 

